In the folder how do I make blender files show a preview of themodel?
Usually, it's done via the windows installer file but sometimes it doesn't work.

You can do it manually though, using command lines.

First, you have to navigate to your Blender installation folder, which by default is C:/Program files/Blender Foundation/Blender.
A simple way to do it is to right-click a Blender shortcut and hit "open file location". You can find one of these shortcuts on your desktop, or in your start menu by typing in "Blender" in the search bar.
Or, if Blender is already running, right-click its icon in the taskbar → Properties → file location.

Once in Blender's folder, click on the path, write "cmd" and press &#9166; Enter. This will open a windows command prompt in the current folder.

Then type in the following command and press &#9166; Enter:

blender -R


If it goes correctly, it should answer this:

Registering file extension...success (user)


You just need to close any windows explorer windows and open again to apply the changes.
Alternatively, you can also do this via the following command:

taskkill /f /im explorer.exe &amp;&amp; start explorer.exe


Note that it will do the registration only for the current user. If you want to do it for the entire system:


open the start menu
type in "cmd"
right-click the command line tools
"run as administrator"
run the command chdir "C:/Program files/Blender Foundation/Blender"(change your blender path if needed)
run the command blender -R
run the command taskkill /f /im explorer.exe &amp;&amp; start explorer.exe
voilà